Commit 6530b9de authored by MyungJoo Ham's avatar MyungJoo Ham
Browse files

PM / devfreq: add min/max_freq limit requested by users. 



The frequency requested to devfreq device driver from devfreq governors
is restricted by min_freq and max_freq input.

Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
parent a95e1f5d

drivers/devfreq/devfreq.c

+70 −0
Original line number Diff line number Diff line
@@ -501,12 +501,82 @@ static ssize_t show_central_polling(struct device *dev, 
		       !to_devfreq(dev)->governor->no_central_polling);

}



static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr,

			      const char *buf, size_t count)

{

	struct devfreq *df = to_devfreq(dev);

	unsigned long value;

	int ret;

	unsigned long max;



	ret = sscanf(buf, "%lu", &value);

	if (ret != 1)

		goto out;



	mutex_lock(&df->lock);

	max = df->max_freq;

	if (value && max && value > max) {

		ret = -EINVAL;

		goto unlock;

	}



	df->min_freq = value;

	update_devfreq(df);

	ret = count;

unlock:

	mutex_unlock(&df->lock);

out:

	return ret;

}



static ssize_t show_min_freq(struct device *dev, struct device_attribute *attr,

			     char *buf)

{

	return sprintf(buf, "%lu\n", to_devfreq(dev)->min_freq);

}



static ssize_t store_max_freq(struct device *dev, struct device_attribute *attr,

			      const char *buf, size_t count)

{

	struct devfreq *df = to_devfreq(dev);

	unsigned long value;

	int ret;

	unsigned long min;



	ret = sscanf(buf, "%lu", &value);

	if (ret != 1)

		goto out;



	mutex_lock(&df->lock);

	min = df->min_freq;

	if (value && min && value < min) {

		ret = -EINVAL;

		goto unlock;

	}



	df->max_freq = value;

	update_devfreq(df);

	ret = count;

unlock:

	mutex_unlock(&df->lock);

out:

	return ret;

}



static ssize_t show_max_freq(struct device *dev, struct device_attribute *attr,

			     char *buf)

{

	return sprintf(buf, "%lu\n", to_devfreq(dev)->max_freq);

}



static struct device_attribute devfreq_attrs[] = {

	__ATTR(governor, S_IRUGO, show_governor, NULL),

	__ATTR(cur_freq, S_IRUGO, show_freq, NULL),

	__ATTR(central_polling, S_IRUGO, show_central_polling, NULL),

	__ATTR(polling_interval, S_IRUGO | S_IWUSR, show_polling_interval,

	       store_polling_interval),

	__ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq),

	__ATTR(max_freq, S_IRUGO | S_IWUSR, show_max_freq, store_max_freq),

	{ },

};

drivers/devfreq/governor_performance.c

+4 −1
Original line number Diff line number Diff line
@@ -18,7 +18,10 @@ static int devfreq_performance_func(struct devfreq *df, 
	 * target callback should be able to get floor value as

	 * said in devfreq.h

	 */

	if (!df->max_freq)

		*freq = UINT_MAX;

	else

		*freq = df->max_freq;

	return 0;

}

drivers/devfreq/governor_powersave.c

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ static int devfreq_powersave_func(struct devfreq *df, 
	 * target callback should be able to get ceiling value as

	 * said in devfreq.h

	 */

	*freq = 0;

	*freq = df->min_freq;

	return 0;

}

drivers/devfreq/governor_simpleondemand.c

+9 −3
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df, 
	unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;

	unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;

	struct devfreq_simple_ondemand_data *data = df->data;

	unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;



	if (err)

		return err;
@@ -41,7 +42,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df, 


	/* Assume MAX if it is going to be divided by zero */

	if (stat.total_time == 0) {

		*freq = UINT_MAX;

		*freq = max;

		return 0;

	}
@@ -54,13 +55,13 @@ static int devfreq_simple_ondemand_func(struct devfreq *df, 
	/* Set MAX if it's busy enough */

	if (stat.busy_time * 100 >

	    stat.total_time * dfso_upthreshold) {

		*freq = UINT_MAX;

		*freq = max;

		return 0;

	}



	/* Set MAX if we do not know the initial frequency */

	if (stat.current_frequency == 0) {

		*freq = UINT_MAX;

		*freq = max;

		return 0;

	}
@@ -79,6 +80,11 @@ static int devfreq_simple_ondemand_func(struct devfreq *df, 
	b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2));

	*freq = (unsigned long) b;



	if (df->min_freq && *freq < df->min_freq)

		*freq = df->min_freq;

	if (df->max_freq && *freq > df->max_freq)

		*freq = df->max_freq;



	return 0;

}

drivers/devfreq/governor_userspace.c

+12 −3
Original line number Diff line number Diff line
@@ -25,10 +25,19 @@ static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq) 
{

	struct userspace_data *data = df->data;



	if (!data->valid)

	if (data->valid) {

		unsigned long adjusted_freq = data->user_frequency;



		if (df->max_freq && adjusted_freq > df->max_freq)

			adjusted_freq = df->max_freq;



		if (df->min_freq && adjusted_freq < df->min_freq)

			adjusted_freq = df->min_freq;



		*freq = adjusted_freq;

	} else {

		*freq = df->previous_freq; /* No user freq specified yet */

	else

		*freq = data->user_frequency;

	}

	return 0;

}